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mount_autofs.c revision 1.2 
      1 /*	$NetBSD: mount_autofs.c,v 1.2 2018/01/22 10:41:18 wiz Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2018 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 #include <sys/cdefs.h>
     32 #ifndef lint
     33 __RCSID("$NetBSD: mount_autofs.c,v 1.2 2018/01/22 10:41:18 wiz Exp $");
     34 #endif /* not lint */
     35 
     36 #include <sys/param.h>
     37 #include <sys/mount.h>
     38 
     39 #include <err.h>
     40 #include <unistd.h>
     41 #include <stdio.h>
     42 #include <stdlib.h>
     43 #include <string.h>
     44 
     45 #include <mntopts.h>
     46 
     47 #include <fs/autofs/autofs_mount.h>
     48 
     49 #include "mount_autofs.h"
     50 
     51 static const struct mntopt mopts[] = {
     52 	MOPT_STDOPTS,
     53 	MOPT_GETARGS,
     54 	MOPT_NULL,
     55 };
     56 
     57 int	mount_autofs(int argc, char **argv);
     58 __dead static void	usage(void);
     59 
     60 #ifndef MOUNT_NOMAIN
     61 int
     62 main(int argc, char **argv)
     63 {
     64 	return mount_autofs(argc, argv);
     65 }
     66 #endif
     67 
     68 void
     69 mount_autofs_parseargs(int argc, char *argv[], void *v, int *mntflags,
     70 	char *canon_dev, char *canon_dir)
     71 {
     72 	int ch;
     73 	mntoptparse_t mp;
     74 	struct autofs_args *am = v;
     75 
     76 	*mntflags = 0;
     77 	while ((ch = getopt(argc, argv, "f:o:O:p:")) != -1)
     78 		switch (ch) {
     79 		case 'f':
     80 			strlcpy(am->from, optarg, MAXPATHLEN);
     81 			break;
     82 		case 'o':
     83 			mp = getmntopts(optarg, mopts, mntflags, 0);
     84 			if (mp == NULL)
     85 				err(EXIT_FAILURE, "getmntopts");
     86 			freemntopts(mp);
     87 			break;
     88 		case 'O':
     89 			strlcpy(am->master_options, optarg, MAXPATHLEN);
     90 			break;
     91 		case 'p':
     92 			strlcpy(am->master_prefix, optarg, MAXPATHLEN);
     93 			break;
     94 
     95 		case '?':
     96 		default:
     97 			usage();
     98 		}
     99 	argc -= optind;
    100 	argv += optind;
    101 
    102 	if (argc != 2)
    103 		usage();
    104 
    105 	strlcpy(canon_dev, argv[0], MAXPATHLEN);
    106 	if (realpath(argv[1], canon_dir) == NULL)    /* Check mounton path */
    107 		err(EXIT_FAILURE, "realpath %s", canon_dir);
    108 	if (strncmp(argv[1], canon_dir, MAXPATHLEN)) {
    109 		warnx("\"%s\" is a relative path.", argv[1]);
    110 		warnx("using \"%s\" instead.", canon_dir);
    111 	}
    112 }
    113 
    114 int
    115 mount_autofs(int argc, char *argv[])
    116 {
    117 	char canon_dev[MAXPATHLEN], canon_dir[MAXPATHLEN];
    118 	char from[MAXPATHLEN], master_options[MAXPATHLEN];
    119 	char master_prefix[MAXPATHLEN];
    120 	int mntflags;
    121 	struct autofs_args am = {
    122 		.from = from,
    123 		.master_options = master_options,
    124 		.master_prefix = master_prefix,
    125 	};
    126 
    127 	mount_autofs_parseargs(argc, argv, &am, &mntflags,
    128 	    canon_dev, canon_dir);
    129 	if (mount(MOUNT_KERNFS, canon_dir, mntflags, &am, sizeof(am)) == -1)
    130 		err(EXIT_FAILURE, "kernfs on %s", canon_dir);
    131         if (mntflags & MNT_GETARGS) {
    132 		printf("from=%s, master_options=%s, master_prefix=%s\n",
    133 		    am.from, am.master_options, am.master_prefix);
    134 	}
    135 
    136 	return EXIT_SUCCESS;
    137 }
    138 
    139 static void
    140 usage(void)
    141 {
    142 	(void)fprintf(stderr,
    143 	    "Usage: %s [-f from] [-O autofs_options] [-o options] [-p prefix] "
    144 		"autofs mount_point\n", getprogname());
    145 	exit(EXIT_FAILURE);
    146 }
    147